code: def obj(self):
      return DataFrame(
          np.random.default_rng(2).standard_normal((3, 4)),
          index=["a", "b", "c"],
          columns=["p", "q", "r", "s"],
      )
  
imports: import numpy
  import pytest
  from pandas import DataFrame, Series
  import pandas._testing
label_desc: Use image node_id 1 for calling the TestDataFrameDot obj's underlying member method code with example usage: obj.obj() and returns: DataFrame